Support MySQL & PostgreSQL stores

[moshest]

This PR will add support for MySQL and PostgreSQL via the SQLStore.

In this PR we will add 3 more packages:

• @neuledge/sql-store - general SQL store with an abstract connection
• @neuledge/mysql-store - a MySQL store based on mysql client
• @neuledge/postgresql-store - a PostgreSQL store based on pg client

Track of implemented store methods:

• listCollections()
• describeCollection()
• ensureCollection()
• dropCollection()
• find()
• insert()
• update()
• delete()

[changeset-bot]

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Latest commit: 052def3

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